Cobham, Surrey
Positive input ventilation (PIV) in Cobham
Loft or wall units that gently push filtered air into the home to tackle condensation. Covering Cobham and KT11, KT13 and KT14.
- From £875 inc VAT per home
- Free survey
We fit loft and wall-mounted PIV units across Cobham, after checking the house first.
Cobham is about 106 miles from our base in Great Barr, Birmingham. We book Cobham visits by appointment and confirm the date in writing. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
PIV in Cobham at a glance
- Town
- Cobham, Surrey
- Postcode districts
- KT11, KT13 and KT14
- Nearby
- Esher (3 miles), Weybridge (4 miles) and Great Bookham (4 miles)
- Price region
- South East
- Survey
- Free survey (UK mainland)
What the work involves
It does not replace extract fans: kitchens and bathrooms still need their own extract to remove steam at source. On survey we check the loft, the landing position and the existing fans, and we tell you if PIV is not the right answer.
Wall-mounted PIV for flats
Draws air from outside through an outside wall. Suits flats and homes with no loft space.
PIV with fan upgrades
PIV plus humidity-controlled extract fans in the kitchen and bathroom for the most stubborn condensation.
Guide prices in Cobham
| Work | Guide price |
|---|---|
| Positive input ventilation (PIV) loft unit, supplied and fitted (per home) | £875–£1,525 inc VAT |
| Wall-mounted PIV unit for a flat (core drilled through an outside wall) (per flat) | £1,100–£1,875 inc VAT |
| Heater module or heated PIV unit (extra over a standard unit) (extra) | £160–£325 inc VAT |
These ranges use our South East rates. Prices include VAT at 20%. You get a fixed written price before any work is booked.
Common reasons people call
- Streaming windows on most mornings in winter
- Black mould on window reveals and in corners of bedrooms
- Musty smell in wardrobes or behind furniture
Rules that apply in England
In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). It sets extract rates for kitchens, bathrooms and utilities and asks for mechanical ventilation to be commissioned and recorded.
Questions from Cobham
What area around Cobham do you work in?
All of Surrey. Near Cobham that includes Esher, Weybridge, Great Bookham and Walton-on-Thames.
How much does PIV cost to run?
A standard PIV unit uses very little electricity, comparable to a low-energy light bulb on normal speed. A heated unit costs more in cold spells because the heater switches on when loft air is cold.
Will PIV make my house cold?
Most units temper or reduce the flow when the incoming air is cold, and a heated unit warms it. Placed correctly on the landing, the air spreads gently rather than blowing on anyone.
Do you cover Cobham and nearby?
Yes. We cover Cobham and nearby places including Esher, Weybridge, Great Bookham and Walton-on-Thames. Send your postcode and we will confirm.
What is the price of a PIV unit in Cobham?
Guide prices for Cobham use South East rates: positive input ventilation (PIV) loft unit, supplied and fitted is typically £875 to £1,525 inc VAT per home. We confirm a fixed price in writing before any work starts.
Send a photo of your loft hatch area and landing ceiling for a quicker Cobham quote.
PIV near Cobham
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Answer a few questions for a price range, or send photos and we will come back to you with a written quote.